Beginning XML with DOM and Ajax : from novice to by Sas Jacobs

By Sas Jacobs

This ebook supplies the main up to date photograph of the topic―XML help within the newest net browsers, growing XML-driven purposes utilizing the main models of internet criteria and server-side languages, together with CSS 2.1/3, DOM, XSLT and XPath 2, Hypertext Preprocessor five, ASP.NET 2, and lots of extra. The publication exhibits for you to provide the reader all they should comprehend to hit the floor operating, with out making them trawl via hundreds and hundreds of pages of syntax. The booklet additionally offers an creation to Ajax-style programming, that is a necessary subject for contemporary internet builders to appreciate. XML is middle to Ajax, so an realizing of it really is crucial while studying how you can application Ajax performance. This e-book accordingly offers a good stepping stone for readers wishing to take this path.

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ATTLIST DVD id CDATA #REQUIRED> ]> ... xml within your resources files. qxd 5/19/06 11:22 AM Page 29 CHAPTER 2 ■ RELATED XML RECOMMENDATIONS It’s possible to have both an internal and external DTD. The internal DTD takes precedence if a conflict exists between element or attribute definitions. It’s probably more common to use an external DTD. This method allows a single DTD to validate multiple XML documents and makes maintenance of the DTD and document instances easier. You can then use an embedded DTD if you need to override the external DTD.

XML schemas allow you to assign data types to character data; DTDs don’t. • XML schemas allow you to define custom data types; you can’t do this within DTDs. • XML schemas support the derivation of one data type from another; you can’t derive data types in DTDs. • XML schemas support namespaces; DTDs don’t support namespaces. qxd 5/19/06 11:22 AM Page 37 CHAPTER 2 ■ RELATED XML RECOMMENDATIONS • XML schemas allow for modular development by providing and ; DTDs don’t offer similar functionality.

Processing Instructions The prolog can also include processing instructions (PIs) that pass information about the XML document to other applications. The XML processor doesn’t process PIs, but rather passes them on to the application unchanged. PIs start with the characters . They usually appear in the prolog, although they can appear in other places within an XML document. xml. Even though the XML declaration looks similar, it’s worth remembering that it’s quite different from a PI. > The first item in a PI is a name, called the PI target.

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